EP4178025A1 - Barre omnibus ffc - Google Patents

Barre omnibus ffc Download PDF

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Publication number
EP4178025A1
EP4178025A1 EP21872681.8A EP21872681A EP4178025A1 EP 4178025 A1 EP4178025 A1 EP 4178025A1 EP 21872681 A EP21872681 A EP 21872681A EP 4178025 A1 EP4178025 A1 EP 4178025A1
Authority
EP
European Patent Office
Prior art keywords
bus bar
welding
high current
flat flexible
ffc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21872681.8A
Other languages
German (de)
English (en)
Other versions
EP4178025A4 (fr
Inventor
Sun-Woo Yun
Sung-Tack HWANG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Energy Solution Ltd
Original Assignee
LG Energy Solution Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Energy Solution Ltd filed Critical LG Energy Solution Ltd
Publication of EP4178025A1 publication Critical patent/EP4178025A1/fr
Publication of EP4178025A4 publication Critical patent/EP4178025A4/fr
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/08—Flat or ribbon cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/514—Methods for interconnecting adjacent batteries or cells
    • H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/50—Fixed connections
    • H01R12/59—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures
    • H01R12/592—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures connections to contact elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/02—Soldered or welded connections
    • H01R4/023—Soldered or welded connections between cables or wires and terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/02—Soldered or welded connections
    • H01R4/029—Welded connections
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G5/00—Installations of bus-bars
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G5/00—Installations of bus-bars
    • H02G5/007—Butt joining of bus-bars by means of a common bolt, e.g. splice joint
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
    • H01R11/01—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts characterised by the form or arrangement of the conductive interconnection between the connecting locations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R35/00—Flexible or turnable line connectors, i.e. the rotation angle being limited
    • H01R35/02—Flexible line connectors without frictional contact members
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present disclosure relates to an FFC bus bar, and more particularly, to an FFC bus bar in which bonding reliability between flat conductor wires of a flat flexible cable and a terminal of a bus bar is improved.
  • Examples of the currently commercialized secondary batteries include a nickel cadmium battery, a nickel hydrogen battery, a nickel zinc battery, a lithium secondary battery, and among these, the lithium secondary battery hardly has memory effect compared to nickel-based secondary batteries and is easily charged or discharged, has a low self-discharge rate and high energy density, and is thus popular for these advantages.
  • secondary batteries are used not only in compact devices such as portable electronic devices but also in middle-to-large sized devices such as electric vehicles or energy storage systems (ESS).
  • ESS energy storage systems
  • a battery pack is configured, in which the battery modules are connected in series and includes a battery management system (BMS) that functionally retains the battery modules and a cooling system, a battery disconnection unit (BDU), or the like.
  • BMS battery management system
  • BDU battery disconnection unit
  • bus bars When configuring the battery pack, a large number of bus bars are used to connect battery modules or other electric parts.
  • the bus bar is manufactured using a copper or aluminum material and in a bar shape, and has low impedance and a high current capacity to allow application of high current, and is useful to be used in a battery pack which has a narrow installation space.
  • the bus bar may be classified into rigid bus bars which have a large allowable current capacity but installation paths of which are fixed and flexible bus bars that are bendable or twistable. Due to the flexibility of the flexible bus bars, installation paths may be configured in various manners with the flexible bus bars, which are thus more popular than the rigid bus bars.
  • the FFC bus bars according to the related art have a structure in which a plurality of stacked conductor wires 3 are covered with a bracket 4 to connect the plurality of stacked conductor wires 3 to the high current terminal 2, and the bracket 4 is fixed to the high current terminal 2 by using rivets.
  • the weak fixing force of the FFC bus bars according to the related art with respect to conductor wires which results in easy separation of the conductor wires from the high current terminal, is often mentioned as their drawback.
  • the present disclosure is designed to solve the problems of the related art, and therefore the present disclosure is directed to providing an FFC bus bar having a firm connection structure between conductor wires and a high current terminal.
  • an FFC bus bar including: a cable stack structure formed by stacking a plurality of flat flexible cables; and a high current terminal connected to at least one end portion of the cable stack structure, wherein each flat flexible cable includes a terminal access portion including strands of conductor wires at at least one end portion thereof, and the terminal access portion is welded to the high current terminal.
  • the high current terminal may include a plurality of welding sheets in a form of a thin plate, and the terminal access portion of each flat flexible cable and each welding sheet may be alternately arranged in layers.
  • the high current terminal may include: a middle part via which the welding sheets are connected in multiple stages; and a fastening part including a bolt-fastening hole and extending in an opposite direction from the welding sheets with the middle part therebetween.
  • the welding sheets, the middle part, and the fastening part may be integrally formed of a metal material.
  • the middle part may have a rectangular plate shape, and have a plate surface having a size corresponding to a cross-sectional area of the cable stack structure.
  • Each welding sheet may be formed of a silver (Ag)-plated copper plate.
  • Each welding sheet may include: a base portion that is flat; and protrusions protruding from a surface of the base portion and provided in a width direction at predetermined intervals, wherein the conductor wires forming the terminal access portion are respectively arranged in concave spaces between the protrusions.
  • a silver plating layer may be provided in the concave spaces.
  • the FFC bus bar may further include a heat shrink tube integrally surrounding the plurality of flat flexible cables.
  • the FFC bus bar may further include a compression band surrounding a circumference of a portion in which the terminal access portion of each flat flexible cable and each welding sheet are integrated.
  • a battery pack including one or more of the FFC bus bars described above.
  • an FFC bus bar having a firm connection structure between conductor wires and a high current terminal may be provided.
  • the FFC bus bar according to the present disclosure has a structure in which a terminal access portion of each flat flexible cable and each welding sheet of the high current terminal are in contact with each other on a one-on-one basis and welded into a single body in the contacting state, and thus, the mechanical rigidity of a connecting portion between each flat flexible cable and the high current terminal is high. Furthermore, by not using components such as rivets or brackets, the high current terminal portion of the FFC bus bar may be simplified and reduced in size.
  • a flat flexible cable (FFC) bus bar to be described below may be used, for example, to connect two battery modules with each other in series or to electrically connect a terminal of a battery module to a relay or connect devices in a battery pack to each other.
  • FFC flat flexible cable
  • the FFC bus bar according to the present disclosure does not have to be used only in battery packs. That is, the FFC bus bar may be used as an electrical connection component for various devices or equipment through which a high voltage or a high current flows.
  • FIG. 2 is a schematic perspective view of an FFC bus bar according to an embodiment of the present disclosure.
  • FIG. 3 illustrates an end portion of a flat flexible cable according to an embodiment of the present disclosure.
  • FIG. 4 illustrates an end portion of a cable stack structure according to an embodiment of the present disclosure.
  • FIG. 5 illustrates a high current terminal according to an embodiment of the present disclosure.
  • the FFC bus bar includes a cable stack structure 10, a high current terminal 20, and a heat shrink tube 30 surrounding the cable stack structure.
  • the cable stack structure 10 is a stack including a plurality of stacked flat flexible cables 11.
  • Each flat flexible cable 11 includes a plurality of conductor wires 12 extending in parallel with each other and an insulating film 13, as illustrated in FIG. 3 .
  • each flat flexible cable 11 is provided with a terminal access portion 15, at least at one end of which the plurality of conductor wires 12 are not covered with the insulating film 13.
  • the terminal access portion 15 is a portion connected to the high current terminal 20 by welding. A detailed description thereof will be given later.
  • the plurality of conductor wires 12 may be manufactured by processing a thin copper plate to have a certain width and thickness, and the conductor wires 12 may be arranged side by side at certain intervals and covered with the insulating film 13.
  • the insulating film 13 may include a base film 13a and a coverlay film 13b, and may be formed of a polyimide material having excellent insulation characteristics and high heat resistance.
  • the plurality of conductor wires 12 may be arranged on and adhered to the base film 13a at certain intervals, and the coverlay film 13b may be adhered thereon.
  • an FFC bus bar which is lightweight and flexible and allows high current conduction may be provided.
  • an allowable current capacity of a single conductor wire 12 of the flat flexible cable 11 may vary depending on a material and a cross-sectional area (SQ) thereof, but each conductor wire 12 may correspond to a current of approximately 3 A. Therefore, in a simple calculation, for example, one flat flexible cable 11 including ten strands of conductor wires 12 may correspond to a current of about 30 A, and a cable stack structure formed by stacking ten flat flexible cables 11 may correspond to a current of about 300 A.
  • the cable stack structure 10 according to the present embodiment is obtained by stacking four flat flexible cables 11 each including four strands of conductor wires 12. This is an example, and to increase the allowable current capacity compared to the present embodiment, the number of conductor wires 12 of each flat flexible cable 11 may be increased, or the number of layers of the flat flexible cable 11 may be increased.
  • the flat flexible cables 11 may be wrapped with the heat shrink tube 30 so as not to be separated from each other.
  • the heat shrink tube 30 is formed of a polyolefin or polypropylene material, and accordingly, when heat is applied thereto, the heat shrink tube 30 may be tightly wrapped around the plurality of flat flexible cables 11 to bind the flat flexible cables 11 such that they are not moved.
  • the above-described cable stack structure 10 may be bent or twisted, and provided as three-dimensional wiring as a flexible bus bar according to the related art.
  • the plurality of flat flexible cables 11 may be taped using an insulating tape (not shown) to be bundled together.
  • the high current terminal 20 may be connected to an external terminal, and may be regarded as a medium to allow a high current flowing in from the external terminal to flow to each conductive wire 12 of the cable stack structure 10.
  • the high current terminal 20 is to be electrically and mechanically connected to one end portion of the cable stack structure 10 and also to be easily connected to a terminal of a battery module or a terminal of an electric part such as a relay device.
  • the high current terminal 20 may include a plurality of welding sheets 21, a middle part 23, and a fastening part 25 to be welded to the terminal access portion 15 of the cable stack structure 10, as illustrated in FIGS. 5 and 6 .
  • the welding sheets 21 are in the form of a thin plate sheet that may be in one-to-one contact with the terminal access portion 15 of each of the flat flexible cables 11, and may be provided in multiple stages.
  • the welding sheets 21 may be configured to have spaces therebetween to allow the terminal access portion 15 of each flexible flat cable 11 to be arranged therebetween.
  • the terminal access portion 15 of each of the flat flexible cables 11 and each of the welding sheets 21 may be alternately arranged in layers, respectively.
  • the cable stack structure 10 includes four flat flexible cables 11, and the terminal access portion 15 of each flat flexible cable 11 includes four conductor wires 12, and the welding sheets 21 of the high current terminal 20 includes four sheets.
  • each terminal access portion 15 of the four flat flexible cables 11 may be arranged in each of the spaces between the four welding sheets 21, thereby forming a connecting portion C between the cable stack structure 10 and the high current terminal 20.
  • each terminal access portion 15 of the four flat flexible cables 11 and the four welding sheets 21 are alternately arranged in layers in an order of from a first-layer welding sheet 21, a first-layer terminal access portion 15, a second-layer welding sheet 21, a second-layer terminal access portion 15, a third-layer welding sheet 21, a third-layer terminal access portion 15, a fourth-layer welding sheets 21, and to a fourth-layer terminal access portion 15.
  • the terminal access portions 15 and the welding sheets 21 may be bonded to each other by welding and thus firmly connected to each other. Therefore, the cable stack structure 10 and the high current terminal 20 are not easily separated even by strong vibration or impact.
  • ultrasonic welding As a method of welding the terminal access portions 15 and the welding sheets 21, ultrasonic welding, resistance welding, brazing welding, etc. may be applied. In the present embodiment, brazing welding is applied.
  • each of the welding sheets 21 may be formed of a silver (Ag)-plated copper plate.
  • each of the welding sheets 21 according to the present embodiment includes a silver plating layer (not shown).
  • the terminal access portions 15 and the welding sheets 21 may be bonded to each other through brazing welding, and here, the silver plating layer of each welding sheet 21 may act as a filler metal. Accordingly, no additional filler metal is required during the brazing welding. In addition, since the silver plating layer is melted and the silver component is uniformly and widely spread between the terminal access portions 15 and the welding sheets 21, the welding quality and electrical conductivity may be improved.
  • the middle part 23 is a portion via which the welding sheets 21 are connected in multiple stages, and may be provided in a form of a block or a rectangular plate having a certain thickness. As one end portions of the welding sheets 21 are connected to the middle part 23 at certain intervals in multiple stages, the intervals may be maintained constant.
  • the middle part 23 may have a broad plate surface having a size corresponding to a cross-sectional area of the cable stack structure 10.
  • the middle part 23 may have a plate surface of a size (length x width) not exceeding a cross-sectional area (thickness x width) of the cable stack structure 10, and thus may be advantageous for providing the high current terminal 20 that is compact and lightweight.
  • the fastening part 25 may have a bolt-fastening hole 25a and may be provided in a plate shape extending in a direction opposite to the welding sheets 21 with the middle part 23 therebetween.
  • the fastening part 25 may have a rectangular plate shape having a certain thickness and may extend horizontally from a middle height of the middle part 23.
  • the fastening part 25 may be connected to a terminal of a battery module or a terminal of an electric part such as a relay device.
  • the fastening part 25 and a terminal of a counterpart may be butted, and a bolt may be inserted into the bolt-fastening hole 25a and tightened using a nut.
  • the welding sheets 21, the middle part 23, and the fastening part 25 may be integrally formed of, for example, a metal material such as copper (Cu). That is, the welding sheets 21, the middle part 23, and the fastening part 25 are conceptually distinct elements, and may be integrally formed as a single body.
  • a metal material such as copper (Cu).
  • the FFC bus bar according to the present embodiment may further include a compression band 40 surrounding a portion in which the terminal access portion 15 of each of the flat flexible cables 11 and each of the welding sheets 21 are integrated.
  • the terminal access portions 15 and the welding sheets 21 may be further fixed and insulated using the compression band 40 after brazing welding. That is, as illustrated in FIG. 2 , the connecting portion C between the cable stack structure 10 and the high current terminal 20 may be wrapped with the compression band 40 and pressed to strengthen fixation, and the connecting portion C may be insulated as exposure of the connecting portion C to the outside is prevented.
  • the FFC bus bar has a structure in which the terminal access portion 15 of each flat flexible cable 11 and each welding sheet 21 of the high current terminal 20 are in contact with each other on a one-on-one basis and welded into a single body in the contacting state, and thus, the mechanical rigidity of a connecting portion between each flat flexible cable 11 and the high current terminal 21 is high. Furthermore, by not using components such as rivets or brackets, the high current terminal 20 of the FFC bus bar may be simplified and reduced in size.
  • FIG. 8 illustrates a high current terminal 20A according to another embodiment of the present disclosure.
  • FIG. 9 illustrates a state in which a cable stack structure 10 and the high current terminal 20A, according to another embodiment of the present disclosure, are connected to each other.
  • FIG. 10 is a cross-sectional view cut along line B-B' of FIG. 9 .
  • FIGS. 8 through 10 Next, another embodiment of the present disclosure will be described with reference to FIGS. 8 through 10 .
  • the present embodiment differs from the above-described embodiment in portions of welding sheets 21 of the high current terminal 20A and a configuration for brazing welding.
  • Each welding sheet 21 of the high current terminal 20A includes, as illustrated in FIG. 8 , a flat base portion 21a and protrusions 21b protruding from a surface of the base portion 21a and provided in a width direction at certain intervals.
  • the protrusions 21b may be elongated in a direction toward the terminal access portion 15, and due to these protrusions 21b, concave spaces O may be provided in the base portion 21a between the protrusions 21b.
  • each of the conductor wires 12 forming the terminal access portion 15 may be arranged in each of the concave spaces O. That is, referring to FIGS. 9 and 10 , in the present embodiment, each of the welding sheets 21 has five protrusions 21b on the base portion 21a in the width direction (X-axis direction), and four concave spaces O are provided between the protrusions 21b.
  • each terminal access portion 15 may be arranged in the four concave spaces O, respectively. At least three surfaces of each conductor wire 12 may be surrounded by the protrusions 21b and the base portion 21a.
  • the terminal access portion 15 of each flat flexible cable 11 and each welding sheet 21 may be alternately arranged in layers, and also, the conductor wires 12 of the terminal access portion 15 may be respectively stably arranged between the welding sheets 21 without shaking.
  • a silver plating layer M may be provided in the concave spaces O of the welding sheet 21.
  • the silver plating layer M may be provided on surfaces of the protrusions 21b forming the concave spaces O and on a surface of the base portion 21a, and as the silver plating layer M is melted during brazing welding, the conductor wires 12 may be bonded to the welding sheets 21.
  • each conductor wire 12 when the silver plating layer M is melted by heat, at least three surfaces of each conductor wire 12 may be bonded to the welding sheet 21.
  • a greater contact area and bonding area between each welding sheet 21 and each conductor wire 12 may be secured compared to the above-described embodiment, and thus, each welding sheet 21 and each conductor line 12 may be connected to each other more firmly than in the above-described embodiment.
  • a battery pack according to the present disclosure may be configured to include one or more of the above-described FFC bus bars.
  • the FFC bus bar may be applied to connect two battery modules to each other in series or to electrically connect a terminal of a battery module to a relay or devices in the battery pack.
  • the battery pack may further include, in addition to the FFC bus bar, one or more battery modules including a cell stack structure which is a set of a plurality of battery cells, and a BMS, fuse, a relay, and the like, as a control device for controlling charging or discharging of the battery modules or a current flow of the battery modules based on voltage and temperature of the battery modules.
  • one or more battery modules including a cell stack structure which is a set of a plurality of battery cells, and a BMS, fuse, a relay, and the like, as a control device for controlling charging or discharging of the battery modules or a current flow of the battery modules based on voltage and temperature of the battery modules.
  • the battery pack may be applied to a vehicle such as an electric vehicle or a hybrid vehicle.
  • the battery pack may also be applied to a power storage device or other IT products.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
EP21872681.8A 2020-09-28 2021-07-12 Barre omnibus ffc Pending EP4178025A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020200126047A KR20220042795A (ko) 2020-09-28 2020-09-28 Ffc 버스바
PCT/KR2021/008890 WO2022065647A1 (fr) 2020-09-28 2021-07-12 Barre omnibus ffc

Publications (2)

Publication Number Publication Date
EP4178025A1 true EP4178025A1 (fr) 2023-05-10
EP4178025A4 EP4178025A4 (fr) 2023-12-27

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Application Number Title Priority Date Filing Date
EP21872681.8A Pending EP4178025A4 (fr) 2020-09-28 2021-07-12 Barre omnibus ffc

Country Status (6)

Country Link
US (1) US20230253685A1 (fr)
EP (1) EP4178025A4 (fr)
JP (1) JP7529193B2 (fr)
KR (1) KR20220042795A (fr)
CN (1) CN115735299A (fr)
WO (1) WO2022065647A1 (fr)

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KR20240033312A (ko) * 2022-09-05 2024-03-12 주식회사 엘지에너지솔루션 절연층을 포함하는 인터 모듈 버스바 및 이를 포함하는 전지팩
KR20240047835A (ko) * 2022-10-05 2024-04-12 주식회사 엘지에너지솔루션 방화벽을 포함하는 버스바 어셈블리 및 이를 포함하는 전지팩

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US20230253685A1 (en) 2023-08-10

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